Thank you. Yes, I almost forgot about the DC bias voltage :( https://passive-components.eu/dc-and-ac-bias-dependence-of-mlcc-capacitors-including-temperature-dependence/
You are right, most of the ceramic caps I was looking at don't publish any data on decrease due to DC bias. I may try it anyway just to see.. but it doesn't look economical right now. Regards, -Moses On Wednesday, May 18, 2022 at 7:42:12 PM UTC-7 nixiebunny wrote: > I haven't tried it, but I can make some observations. The MAX1771 isn't > connected directly to the output circuit, so it's not likely to suffer from > a problem. The current flows through the inductor which will accommodate a > momentary short circuit caused by the capacitor. > In short, it shouldn't be a problem. > Bear in mind that the effective capacitance of a modern ceramic capacitor > is much lower with a DC bias near its rated voltage, so you would need to > use either capacitors rated for 5x the output voltage, or about 5x the > desired capacitance. > Some capacitor data sheets publish this reduction in capacitance as a > function of bias voltage, most don't. Look for it. > > > On Wed, May 18, 2022, 6:49 PM Moses <mo...@neonixie.com> wrote: > >> Before I let the magic smoke out of half a dozen MAX1771 ICs.. has anyone >> ever tried using ceramic output capacitors? It wants a low ESR capacitor, >> so ceramics may work well. >> >> The datasheet doesn't mention ceramics on the output side.. but then >> again it was written a few decades ago when the required >> voltage/capacitance probably was not readily available. >> >> Regards, >> -Moses >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to neonixie-l+...@googlegroups.com. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/7ae38dca-64ca-459d-a1e5-283a062f8f9en%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/7ae38dca-64ca-459d-a1e5-283a062f8f9en%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/5b4c1599-fc2a-48b5-b56d-32c50be101dbn%40googlegroups.com.
